I'll do as you say, Jerry. I don't usually like using additives for anything unless I have to. It's only got a 7 lb cap on it, but I've removed it when hot, and there is almost no pressure ever behind it.
If that doesn't work, I already have a can of Bar's Leaks on the shelf, for when my radiator starts leaking. The guy at the radiator shop wouldn't clean it for me, because he said if he did, it would leak like a sieve on the bottom. This radiator doesn't leak yet, and hopefully it won't until I can find a good replacement or at least a core.
